Rockwell Automation 1797-PS2E2 FLEX Ex Power Supply User Manual
Page 7
FLEX Ex Power Supply 7
Publication
1797-5.8 - June 2010
Installation and Commissioning
The power supply unit can be located in Zones 1, 2, and 22 as stated on its
label. The output circuits are according to the ignition protection class Ex ib
and can be installed in Zones 1, 2, and 22. When installing, you must heed the
EC- type examination certificate (especially the special conditions) and the
applicable national and local construction, installation, and operating
regulations.
The housing (Ex d) must not be opened (screw cover). Connections are made
in the (Ex e) terminal box.
Install the power feed lines only in the deenergized state. Also follow the
information on the type label, respectively the covers of the terminals.
You can connect and disconnect the intrinsically-safe output terminals during
operation.
All unused cable glands must be covered by appropriate prototype tested Ex e
lead seals to keep the requirement of IP54.
The cover installed on the nonintrinsically-safe screw terminals
(IP30) may be removed only in the deenergized state and must be remounted
after working on these terminals.
Before closing the cover of the (Ex e) wiring box, inspect the seal for any
signs of damage. In case of damage, the seal must be replaced by a new seal
that is identical to the damaged seal.
The power supply housing contains two flanges, which can be connected to a
wall or other structural part by means of fixing screws. Select fixing screws
that ensure secure fixing of the power supply. Consider the condition of
vibration of the power supply when making this selection.
On the (Ex d) housing there is an earthing screw. This screw must be
connected to Earth with a conductor having a minimum of 4 mm² (0.006 in.
2
)
area. The connection has to be protected against self-opening and corrosion.
Corrosion protection can be achieved by using tinned terminal ends.
Before opening the (Ex e) terminal box (for example, for maintenance
purposes), it must be cleaned of all dust particles to ensure that no dust can
enter the box.